1256264402 has 16 divisors (see below), whose sum is σ = 2002620672. Its totient is φ = 588997440.

The previous prime is 1256264389. The next prime is 1256264407. The reversal of 1256264402 is 2044626521.

It is not an unprimeable number, because it can be changed into a prime (1256264407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58958 + ... + 77385.

It is an arithmetic number, because the mean of its divisors is an integer number (125163792).

Almost surely, 2^1256264402 is an apocalyptic number.

1256264402 is a deficient number, since it is larger than the sum of its proper divisors (746356270).

1256264402 is a wasteful number, since it uses less digits than its factorization.

1256264402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136633.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 1256264402 is about 35443.8203640635. The cubic root of 1256264402 is about 1079.0138466118.

The spelling of 1256264402 in words is "one billion, two hundred fifty-six million, two hundred sixty-four thousand, four hundred two".